Hi, well I would say I have been fortunate in that as a young person I went down a route of doing a lot of personal therapy and self development, though with unawareness of autism. This was very helpful, and assisted me in understanding a range of issues, especially family issues and how my upbringing had affected me, etc.
I became a therapist, and eventually self diagnosed as ASD1, when I was doing some further training and working with young people with ASD 1, and understood it's relevance to myself.
This was because despite a lot of useful progress over the years in therapy and through reading and self development, certain areas didn't really change, and I concluded that if it was a case of learning new skills I would have learnt them by then, whereas despite my extensive knowledge about interpersonal skills and social communication, which I had both taught about and written a textbook on, I still found unstructured social communication a mysterious process.
It was a revelation to realise it actually was a difference in me , rather than me being apparently unable to grasp or apply what seemed so straightforward to most others.